* using cygwin inetd to start a script on a server to run a java application @ 2014-06-05 16:22 annie s [not found] ` <5390CFF2.2060501@cs.umass.edu> 0 siblings, 1 reply; 4+ messages in thread From: annie s @ 2014-06-05 16:22 UTC (permalink / raw) To: cygwin Hi, I am following the oracle doc http://docs.oracle.com/javase/7/docs/technotes/guides/rmi/inetd/launch-service.html (solaris specific) I have two windows 2012 server VMs (firewalls off). I believe that I have configured cygwin inetd correctly by following the directions in C:\cygwin64\usr\share\doc\Cygwin\inetutils-server.README, running /usr/bin/iu-config using values ntsec and creating user cyg_server on the server. I start and stop inetd using cygrunsrv -S inetd and cygrunsrv -E inetd. I have cygwin inetd ftp working on the machines. What I am trying to do is to get the client to call an inetd service on the server which in turn runs a script on the server which sets up the environment and calls a java class called "Server". My C:\cygwin64\etc\inetd.config on the server ftp stream tcp nowait annie /usr/sbin/ftpd ftpd example-server stream tcp wait cyg_server /nms/bin/test/test test c:\windows\system32\drivers\etc\services on the server example-server 9999/tcp i think the hosts file on both the server and the client is corrently configured because ftp between the client and the server works the test script on the client sets up the environment and then calls /cygdrive/c/Apps/Java/jdk1.7.0_51/bin/java -Djava.net.preferIPv4Stack=true -Djava.net.preferIPv4Addresses=true -classpath c:\\cygwin64\\nms\\bin jmini.nms.console.inetd.Server 9999 &> /tmp/tmp.dat Using Process Explorer I can see the client calling the cygwin inetd service, and a java exe being created. The Server code is called but the client timesout. tmp.dat on the server contains proxy Proxy[ServiceInterface,RemoteObjectInvocationHandler[UnicastRef [liveRef: [endpoint:[192.168.100.10:57036](local),objID:[27e13e26:14662d7e06e:-7fff, -976951803438894493]]]]] server: failed to initialize registry proxy Proxy[ServiceInterface,RemoteObjectInvocationHandler[UnicastRef [liveRef: [endpoint:[192.168.100.10:57036](local),objID:[27e13e26:14662d7e06e:-7fff, -976951803438894493]]]]] on port 9999 Exception java.net.BindException: Address already in use: JVM_Bind Looking at TCP view on start up there are two inetd processes, the ftp process (port 21) and the example-server (port 9999) process. when i start the client there are three inetd processes, the ftp process (port 21), the example-server (port 9999) process remote address the server, and the example-server (port 9999) process remote address the client. the java process starts on a port that is not shared with any other process. and the client dies with a java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is: java.net.SocketTimeoutException: Read timed out My questions are can you see how I have misconfigured this? Have you got a cygwin inetd process running a script/ java process and could you share the secret sauce with me? Thank you in advance Annie -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 4+ messages in thread
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[parent not found: <CAK03LAoUzNK0t4JFSVNWj6q5qGZY1Wmc0SmKz9kBZHkwGvYeEw@mail.gmail.com>]
* Re: using cygwin inetd to start a script on a server to run a java application [not found] ` <CAK03LAoUzNK0t4JFSVNWj6q5qGZY1Wmc0SmKz9kBZHkwGvYeEw@mail.gmail.com> @ 2014-06-06 19:05 ` Eliot Moss [not found] ` <CAK03LAqKM8NQa1QjCONpznHO-=-Oexzu3qgvLjcc+PZJ53Lz1w@mail.gmail.com> 0 siblings, 1 reply; 4+ messages in thread From: Eliot Moss @ 2014-06-06 19:05 UTC (permalink / raw) To: annie s; +Cc: cygwin Dear Annie -- Again, I am not a deep expert, but the TCPView output looks to be what I would expect if the inetd forks a copy of itself to handle a new client connection. A TCP connection (as you probably know) is distinguished by *both* the local host/port pair *and* the remote host/port pair. So a local port can certainly be used in multiple connections. It will, however, be a different socket within the server. I notice that the Java process is also listening, but on a different local port. I am guessing that that is for the intended RMI connection. That is, the point of the example-server port is to give the ability to spawn Java jobs. They then listen on their own port to establish an RMI connection. I presume that either the spawned inetd or the spawned Java somehow communicates back to the remote client the port number for the RMI protocol, namely 57088, so that the remote client can connect to the listening Java instance. I think maybe your issue has to do with wait/nowait in the inetd.conf entry. One setting causes inetd itself to accept the connection, the other causes the spawned server process to do it. Which way it should work depends on the server process. The two ways are: 1) wait: spawn only ONE server process and it handles all bind requests; inetd starts it only if a new request comes and the server process is not already running. This is the normal case for udp/datagram types of services. 2) nowait: spawn a server process for each request; inetd handles the bind. This is normal for tcp. So, if for RMI the model is ONE server process that then handles all RMI requests for that host, even though the request may be for a tcp connection, wait would be correct. That is what this page seems to indicate: http://docs.oracle.com/javase/7/docs/technotes/guides/rmi/inetd/launch-service.html#2 I see that you wrote nowait. I suggest changing it to wait. I am copying this reply to the cygwin list for the archives. Regards -- Eliot Moss -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 4+ messages in thread
[parent not found: <CAK03LAqKM8NQa1QjCONpznHO-=-Oexzu3qgvLjcc+PZJ53Lz1w@mail.gmail.com>]
* Fwd: using cygwin inetd to start a script on a server to run a java application [not found] ` <CAK03LAqKM8NQa1QjCONpznHO-=-Oexzu3qgvLjcc+PZJ53Lz1w@mail.gmail.com> @ 2014-06-09 14:41 ` annie s 2014-06-09 14:48 ` Eliot Moss 0 siblings, 1 reply; 4+ messages in thread From: annie s @ 2014-06-09 14:41 UTC (permalink / raw) To: cygwin Hi Eliot, I really appreciate your time looking at this... " ftp stream tcp nowait annie /usr/sbin/ftpd ftpd example-server stream tcp wait cyg_server /nms/bin/test/test test " fyi example server is set to wait (and ftp is set to nowait) i apologize if that was confusing. has anyone any other suggestions? thank you again annie -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Fwd: using cygwin inetd to start a script on a server to run a java application 2014-06-09 14:41 ` Fwd: " annie s @ 2014-06-09 14:48 ` Eliot Moss 0 siblings, 0 replies; 4+ messages in thread From: Eliot Moss @ 2014-06-09 14:48 UTC (permalink / raw) To: cygwin On 6/9/2014 10:41 AM, annie s wrote: > Hi Eliot, I really appreciate your time looking at this... > > " > ftp stream tcp nowait annie /usr/sbin/ftpd ftpd > example-server stream tcp wait cyg_server > /nms/bin/test/test test > " > > fyi example server is set to wait (and ftp is set to nowait) > > i apologize if that was confusing. > > has anyone any other suggestions? So here's a wondering, broadening the strategy for addressing your real desire, which is to have a Java server program spawned automatically. Oracle must have developed a preferred way for doing this on Windows systems. The 'java' program (the Java Virtual Machine) is a native Windows program. Why not use the native Windows way of doing this, whatever it is? Regards -- Eliot -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-06-09 14:48 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-06-05 16:22 using cygwin inetd to start a script on a server to run a java application annie s [not found] ` <5390CFF2.2060501@cs.umass.edu> [not found] ` <CAK03LAoUzNK0t4JFSVNWj6q5qGZY1Wmc0SmKz9kBZHkwGvYeEw@mail.gmail.com> 2014-06-06 19:05 ` Eliot Moss [not found] ` <CAK03LAqKM8NQa1QjCONpznHO-=-Oexzu3qgvLjcc+PZJ53Lz1w@mail.gmail.com> 2014-06-09 14:41 ` Fwd: " annie s 2014-06-09 14:48 ` Eliot Moss
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